All the basic physics books Ive read explain heat as particles in motion. This means a hot chunk of matter is simply one which has its particles bouncing around more rapidly than a cooler chunk. I accepted this description for awhile. However, since I started to think about it more, It would seem to me that the idea of 'bouncing' particles is probably a very simplified one. For instance, what would a single hydrogen molecule (atom) floating in space look like if it had more or less heat energy? So basically what I'm asking for is a more detailed explanation of heat...?